A sunbed in there is $20 half day, $40 per day. A cabina is $140 per day. Give guest services a call once on board.
Formal evening dress code is not rigidly enforced- jacket & tie accepted, though as many people make the effort, I would advise a ‘smart’ appearance, especially if planning to dine in main or speciality rooms in those evenings. Some passengers were never out of track suit and shorts.